Answer:
A concrete form is just a box that holds wet concrete in shape until it sets. They are normally wood but I've seen metal forms a lot too. It has to be removable when the concrete hardens, usually by taking it apart. First, find your grade, that's the level you want the concrete to be at when it's finished. Drive some stakes around the area and suspend strings where the edges will be. Drive larger stakes along the strings. Fasten the boards to the stakes with the top edge on grade. Make sure to support it a lot along the board with additional stakes because concrete is very heavy. Add or remove fill in the form until you have the depth you want. Your ready to pour.